I didn´t try to compile trunk yet, but all my development branches where I merged trunk recently (trunk rev 9084) are affected. A branch where the last merge with trunk happened several weeks ago compiles fine.

Does anyone else have that problem? Suggestions how to solve are appreciated

Great to hear you are ready to compile again. I would suspect ICU Package updated with Ubuntu being the culprit from the above error message. As the dependencies are managed in cmake you never know why it works or why not

I have been unable to compile for a week, mainly seems to be the usual sort of boost errors but every attemp gave different errors. A system update today seemed to solve the problem, it did include icu, but I now get a fatal crash running WL

This looks like as if there might be a mergeconflict in either mapobjects.lua or world/init.lua cause this is the only case how << could have been gone in there. so please check the 2 files for any anomalies